A113 in Brave, carved in Roman numerals (ACXIII) above the doorway.
UPDATE: 20:33 (GMT) - you can now check out the references (including a newly found one, paying homage to the late-great Cars co-director Joe Ranft) in hi-res below; again via The Pixar Post.
Those wonderful guys over at The Pixar Post have a breakdown of all the Easter Eggs you can see, ranging from Pixar-mainstays to some rather more interesting ones. We've already seen some of them before - the Pizza Planet Truck, Sulley from Monsters, Inc. and Monsters University, and a newt reference - but we also, finally, now know the location of A113 in the film (and the Luxo ball pops up as well).
A113 (top) isn't the most highly-defined and visible in the world, but it's there, and we'll add it to our A113 page ASAP! Check out the rest, of the slightly more visible Easter Eggs, below!
The Luxo ball, clearly - well, maybe not clearly - visible in the Witch's clutter.
The Witch's carving of the Pizza Planet Truck, which appears in every Pixar film except for The Incredibles.
Sulley from Monsters, Inc., who will also appear in next year's Monsters University, doubling up as a reference to past and future Pixar films.
A newt, paying reference to Pixar's cancelled film of the same name.
A carving of the late-great Joe Ranft's face.
Brave hits Blu-ray and DVD in the UK on 26th November - you can pre-order it below. In the meantime, to whet your Pixar appetite, Pixar Short Films Collection: Volume 2 is out now in the UK and you can buy it here, and check out our exclusive review of Monsters, Inc. 3D (released 19th December, US; 18th January, UK).
Pictures and Easter Egg-spotting courtesy of The Pixar Post.